Alternator Filter Cap Replacement, Alternate PN?

[OldGlassMan]

Does anyone have any experience with replacement of the Alternator Output Filter (Electrolytic Capacitor on the bulkhead just where the power pass-thru is)?  This is NOT the RFI capacitor on the alternator, but is the main DC power filter.  The parts manual for my '68 G model calls for a Sangamo Part Number, 500-1041-01, but this cap is no longer made.  It is a 2400 mfd (uF), 25 volt electrolytic with screw connections.  I cannot find an identical capacitor, although I am sure Mooney has superseded the part number and has something they will sell me for six times what it costs from anywhere else.

[1964-M20E]

look on the electronic sites for at 2400mfd cape with screw terminals rated 25V or greater.  Order it and replace the one you have now.

[N601RX]

As John aluded to the voltage marked on a cap is just the Max voltage it can tolerate before beginning to break down. It can be used at any voltage lower than the marked voltage. A Cap with a higher voltage will work fine. You may not be easy to find a 25 volt one that size, but should be easy to find a 50. You might want to look at he max temp rating also. Some are lower than others. Try digikey or mouser. There was also one on ebay a while back, not sure if it is still there.

[N201MKTurbo]

Most of the ones you will find will not be as rugged as the original. It has hermetically sealed ceramic binding posts. I have found that it does very little to suppress alternator noise and just bypassing it should be considered. It was installed on airplanes that had generators and was used to suppress commutater noise.

[N201MKTurbo]

http://www.aircraftspruce.com/pages/el/noisefilters/lonestarFilter70amp.php

 

 

This one should work for you.